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// Rights Reserved. Permission to use, copy, modify, and distribute this
// software and its documentation without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph appear in all copies.  This software program and
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// does not warrant that the operation of the program will be
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// File: MutableGraphEvent.java
// Interfaces: MutableGraphEvent
// Original Author: jrobbins@ics.uci.edu
// $Id: MutableGraphEvent.java 1153 2008-11-30 16:14:45Z bobtarling $

package org.tigris.gef.graph;

import java.util.EventObject;

/**
 * A notification that a graph has changed. The source is the object that
 * implements MutableGraphModel. The argument is the specific node or edge that
 * was involved when a node or edge is added or removed. The argument is null if
 * the entire graph changed.
 */

public class MutableGraphEvent extends EventObject {
    private static final long serialVersionUID = -9143159532643088192L;
    /** The specific node, port, or arc that was modified. */
    private Object _arg;

    public MutableGraphEvent(Object src) {
        this(src, null);
    }

    public MutableGraphEvent(Object src, Object arg) {
        super(src);
        _arg = arg;
    }

    public Object getArg() {
        return _arg;
    }
} /* end class MutableGraphEvent */
